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Silicon‐29 NMR Study of Alkali‐Exchanged NaY Zeolites
Author(s) -
Chern JerYoung,
Chao KueiJung
Publication year - 1991
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199100020
Subject(s) - chemistry , alkali metal , chemical shift , ion , silicon , zeolite , molecular sieve , inorganic chemistry , crystallography , adsorption , catalysis , organic chemistry
High‐resolution solid‐state 29 Si NMR has been applied to the study of partially exchanged Li, K, and Cs NaY zeolites. The order of the 29 Si chemical shifts of dehydrated samples is Li, Na‐Y < Na‐Y < K, Na‐Y. The correlation between the 29 Si chemical shift and the Li or K loading on Li, Na‐Y or K, Na‐Y was rationalized in terms of the interaction between the framework and the cations inside the small cages. Because of the restrictive migration of large Cs + ions from the supercages to the small cages, the 29 Si chemical shift of Cs, Na‐Y was found to be similar to that of Na‐Y.